Vulnerability in JWTDecoder.decode (CVE-2018-1000125)

Summary

Vulnerability in JWTDecoder.decode (CVE-2018-1000125). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 1.3.0 or later.

Original description

The description as published by the source.

inversoft prime-jwt version prior to version 1.3.0 or prior to commit 0d94dcef0133d699f21d217e922564adbb83a227 contains an input validation vulnerability in JWTDecoder.decode that can result in a JWT that is decoded and thus implicitly validated even if it lacks a valid signature. This attack appear to be exploitable via an attacker crafting a token with a valid header and body and then requests it to be validated. This vulnerability appears to have been fixed in 1.3.0 and later or after commit 0d94dcef0133d699f21d217e922564adbb83a227.

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2018-1000125 has been found in JWTDecoder.decode.
Successful exploitation can lead to full system takeover.
What to do: upgrade JWTDecoder.decode to 1.3.0 or later.
If unsure, ask your IT team or search "JWTDecoder.decode CVE-2018-1000125" on the vendor's site.

CVE-2018-1000125 (JWTDecoder.decode)
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1.3.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (unclassified) exists in JWTDecoder.decode.

📍 Affected scope

Check the vendor advisory for the affected versions of JWTDecoder.decode.

🔥 Severity

Severity: ?. Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 1.3.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'JWTDecoder.decode' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
grep -r 'JWTDecoder.decode' . | grep -v node_modules
```
リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で JWTDecoder.decode を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade JWTDecoder.decode to 1.3.0
```
ステージング環境で 1.3.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
3
Post-deployment verification verify
```
Confirm patched version is live in production
```
パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

References

advisory github.com
advisory github.com